Air quality in Higashimatsuyama, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Higashimatsuyama, Japan

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

Today the air quality in Higashimatsuyama is classified as Moderate. The primary pollutant identified is PM2.5, with a reported concentration of 10.0 µg/m³, which matches the reference value used for assessment. No reference value is provided for PM10. The assessment is based on eight valid measurements collected for the city. Data is shown via OpenAQ.

These eight measurements were recorded on 2026-02-23 00:00 UTC and together support the Moderate classification for the current period. The reported PM2.5 concentration reflects the level used in the category determination. The dataset represents the most recent sampling interval available for the location. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.

Latest sensor values

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

What the data includes

The dataset for Higashimatsuyama includes measurements of four pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX) and fine particulate matter (PM2.5). All values come from two monitoring stations located at 東松山市五領町８番地, and a total of eight data rows were recorded within the most recent 30‑day window, meaning the information is current as of the latest timestamp on 2026‑02‑10 22:00 UTC. No rows are classified as old or unknown, so the coverage is both recent and complete for the period covered.

Across the two stations the observed concentrations show a very narrow spread. NO values range from a minimum of 0.011 ppm to a maximum of 0.012 ppm, with a median of 0.0115 ppm; NO₂ is constant at 0.02 ppm for both the minimum and maximum, giving a median of the same value; NOX varies between 0.031 ppm and 0.032 ppm, with a median of 0.0315 ppm. PM2.5 measurements are expressed in micrograms per cubic metre and range from 4.0 µg/m³ up to 10.0 µg/m³, the median sitting at 7.0 µg/m³. These figures indicate that, for the period captured, the pollutant levels are tightly clustered around their central values, with the particulate matter showing a slightly broader range than the gaseous species.

Because every recorded row falls within the last 30 days, the dataset reflects a snapshot of recent air quality rather than long‑term trends. The two‑station network provides consistent coverage for all four pollutants, but the limited number of sites means that spatial variation across the wider city area is not captured. Users should keep in mind that conditions can differ by location and time, even though the present data are fresh and uniformly reported.

Learn more about sources and filtering: About the data.

Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)

Latest sensor values (bars)

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

Data notes

The dataset for Higashimatsuyama includes eight valid measurements and is updated within 30 days, with the most recent data recorded on 2026-02-10T22:00:00+00:00. These values represent a snapshot of ambient conditions and should be interpreted accordingly. Air quality can vary by location and time within the city, so conditions at a specific site may differ from the reported averages.

OpenAQ station rows